A 29-year-old woman from a high TB-prevalence country presents with a 4-week history of cough, night sweats and weight loss. Chest X-ray shows right upper-lobe infiltrates. What is the most appropriate next diagnostic step?AStart empirical antibiotics and review in 6 weeksBArrange three early-morning sputum samples for acid-fast bacilli and send for cultureCArrange CT pulmonary angiogramDBronchoscopy onlyENo further investigation; likely viral infectionCheck my answer